21 research outputs found
Luminescence of a Cooper Pair
This paper theoretically discusses the photon emission spectra of a
superconducting pn-junction. On the basis of the second order perturbation
theory for electron-photon interaction, we show that the recombination of a
Cooper with two p-type carriers causes drastic enhancement of the luminescence
intensity. The calculated results of photon emission spectra explain
characteristic features of observed signal in an recent experiment. Our results
indicate high functionalities of superconducting light-emitting devices.Comment: 4 pages, 3 figures embedde
Transport properties of Andreev polarons in superconductor-semiconductor-superconductor junction with superlattice structure
Transport properties of a superconductor-semiconductor-superconductor
(S-Sm-S) junction with superlattice structure are investigated. Differential
resistance as a function of voltage shows oscillatory behavior under the
irradiation of radio-frequency (RF) waves with the specific frequency of 1.77
GHz regardless of the superconducting materials and the junction lengths.
Experimental data are quantitatively explained in terms of the coupling of
superconducting quasiparticles with long-wavelength acoustic phonons indirectly
excited by the RF waves. We propose that the strong coupling causes the
formation of novel composite particles, Andreev polarons.Comment: 4 pages, 4 figure
Quantum Nonlinear Optics
This graduate-level textbook gives an introductory overview of the fundamentals of quantum nonlinear optics. Based on the quantum theory of radiation, Quantum Nonlinear Optics incorporates the exciting developments in novel nonlinear responses of materials (plus laser oscillation and superradiance) developed over the past decade. It deals with the organization of radiation field, interaction between electronic system and radiation field, statistics of light, mutual manipulation of light and matter, laser oscillation, dynamics of light, nonlinear optical response, and nonlinear spectroscopy, as well as ultrashort and ultrastrong laser pulse. Also considered are Q-switching, mode locking and pulse compression. Experimental and theoretical aspects are intertwined throughout